I have +12 on pin 4 of the DB-9 serial port connector on my car sled. This is a female connector and pin one is the right-most position on the top row (five positions) facing the unmated connector. Txd is on pin 2 and Rxd is on pin 1 with pins 5 and 8 being ground. The male connector on the back of the Empeg itself does not seem to provide power on pin 4.

The Garmin spec claims 65 ma at +12 vdc for the 6-40 vdc version, so this should not present an excessive load to the Empeg +12 output.

If I can be of any help I would be glad to try if you are also in the Bay area!

Lynn